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ENS 53398
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Category
ENS Notification  and Power Reactor
CFR
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident +, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material +, 10 CFR 50.72#b3vC +  and 10 CFR 50.72#b3vD +
Current power
58  +
Current reactor mode
Power Operation +
Description
At 1011 EDT on May 11, 2018, Containment S … At 1011 EDT on May 11, 2018, Containment Shield Building Annulus differential pressure exceeded the required limit. The Shield Building was declared inoperable requiring entry into Technical Specification (TS) 3.6.15 Conditions A and B. The event was initiated by failure of the operating annulus vacuum fan. Main Control Room Operators manually started the stand-by annulus vacuum fan to recover pressure. Shield Building Annulus differential pressure was restored to the required value at 1016 EDT and TS 3.6.15 Condition A and B were exited on May 11, 2018 at 1016 EDT.</br>The failure mechanism for the annulus vacuum fan is being investigated.</br>The Containment Shield Building ensures the release of radioactive material from the containment atmosphere is restricted to those leakage paths and associated leakage rates assumed in the accident analysis during a Loss of Coolant Accident (LOCA). The Emergency Gas Treatment System (EGTS) would have automatically started and performed its design function to maintain the Shield Building Annulus differential pressure within required limits.</br>The event is being reported pursuant to 10 CFR 50.72(b)(3)(v)(C) and 10 CFR 50.72(b)(3)(v)(D). The NRC Resident has been notified.v)(D). The NRC Resident has been notified.  +
Discovered date
14:11:00, 11 May 2018  +
Emergency class
Non Emergency +
Entered date
15:19:00, 11 May 2018  +
Event date
14:11:00, 11 May 2018  +
Event description
At 1011 EDT on May 11, 2018, Containment S … At 1011 EDT on May 11, 2018, Containment Shield Building Annulus differential pressure exceeded the required limit. The Shield Building was declared inoperable requiring entry into Technical Specification (TS) 3.6.15 Conditions A and B. The event was initiated by failure of the operating annulus vacuum fan. Main Control Room Operators manually started the stand-by annulus vacuum fan to recover pressure. Shield Building Annulus differential pressure was restored to the required value at 1016 EDT and TS 3.6.15 Condition A and B were exited on May 11, 2018 at 1016 EDT.</br>The failure mechanism for the annulus vacuum fan is being investigated.</br>The Containment Shield Building ensures the release of radioactive material from the containment atmosphere is restricted to those leakage paths and associated leakage rates assumed in the accident analysis during a Loss of Coolant Accident (LOCA). The Emergency Gas Treatment System (EGTS) would have automatically started and performed its design function to maintain the Shield Building Annulus differential pressure within required limits.</br>The event is being reported pursuant to 10 CFR 50.72(b)(3)(v)(C) and 10 CFR 50.72(b)(3)(v)(D). The NRC Resident has been notified.v)(D). The NRC Resident has been notified.  +
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ENS 53398 +, ENS 53398 +, ENS 53398 +, ENS 53398 +, ENS 53398 +, ENS 53398 +, ENS 53398 +, ENS 53398 +, ENS 53398 +, ENS 53398 +, ENS 53398 +, ENS 53398 +, ENS 53398 +, ENS 53398 +  and ENS 53398 +
Initial power
58  +
Initial reactor mode
Power Operation +
Last update date
00:00:00, 11 May 2018  +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
11:30:16, 14 May 2018  +
NRC officer
Donald Norwood +
Notification date
15:19:00, 11 May 2018  +
Originated by
Chuck Broesche +
Reactor critical
true  +
Reactor scram
false  +
Reactor type
Westinghouse PWR 4-Loop +
Region
NRC Region 2 +
Reporting criterion
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident +  and 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material +
Reporting time
0.0471 d (1.13 hours, 0.00673 weeks, 0.00155 months)  +
Site
Watts Bar +
Start date
14:11:00, 11 May 2018  +
State
Tennessee +
System
Shield Building +  and Emergency Gas Treatment System +
TS
TS-3.6.15 +
Title
Containment Shield Building Inoperable  +
URL"URL" is a <a href="/Special:Types/URL" title="Special:Types/URL">type</a> and predefined property provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a> to represent URI/URL values.
https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2018/20180514en.html#en53398  +
Unit
2  +
 
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